Electrical connector



March 7, 1950 E. 1. ENGQvlsT ELECTRICAL CONNECTOR Filed May 9, 1945Patented Mar. 7, 1950 ELECTRICAL CONNECTOR Erik Isidor Engqvist,Stockholm, Sweden, as-

signor to Teleonaktiebolaget L M Ericsson,

a company of Sweden Stockholm, Sweden,

Application May 9, 1945, Serial No. 592,768 In Sweden .lune 19, 1944 4Claims.

The invention relates to a device for electrical connection of a wire toa contact device, preferably for connecting a switchboard cord to aplug. Hitherto the cord has usually been connected to the plug by meansof screws, two 01 more of the wires of the cord thereby being providedwith thimbles which by means of screws have been connected to the plug.Said screw connection entails the inconvenience that the plug is rathercomplicated and not suitable for modern manufacturing methods. It isbesides a rather tedious work to change from one cord to another, due tothe diiculties in dealing with the small connection screws.

It is an object of the present invention to eliminate these drawbacks.

The invention will be more closely described with reference to theaccompanying drawing showing an embodiment. Fig. 1 is a side view of thecord and the plug detached, Fig. 2 is a longitudinal section of cord andplug and Fig. 3 a side view showing the cord fastened to the plug, Fig.4 is an end view of the thimbles and Fig. 5 is a section of the cordalong the line 5-5 in Fig. 2. The thimbles of the cord are at one oftheir ends formed as cylindrical sleeves I and 2, provided with slots 3and 4, respectively, so as to make the sleeves resilient. At the otherend of the thimbles which is to be connected to the wire, the sheetmetal, of which the thimble is produced, is bent in such a way that thethimbles are in the form of segments 5 and 6, enclosing the wires 9 andI9, respectively. The thimble I is longer and has greater diameter than.the thimble 2. The thimbles are mounted with the at surfaces of thesegmental ends lying on each side of an insulating washer 1, the cordconnection thereby obtaining a circular section and the sleeves I and 2,respectively, lying concentrically but axially displaced relative toeach other. The thimbles are xed in this position and enclosed by aninsulating sleeve 8 over which a wire I5 is wound. The plug consists ina manner known per se of concentrically arranged parts II, I2 and I3insulated from each other. As one end of the plug the innermost part ofthat portion to which the cord is to be connected is formed as acylindrical pin I2a, conformed to the smaller sleeve 2 of the cord andthe center element I3 is formed in a corresponding manner so as toconform to the larger sleeve I of the cord. Contact between cord andsleeve is then obtained by pushing the sleeves over the correspondingportions of the plug, an elastic connection between the sleeves and theportions of the plug thereby being obtained. The elements I2 and I3 atthe opposite end of the plug are suitably formed as indicated 2 at IZband I3b to engage a jack (not shown). The cord may thereafter befastened to the plug in a manner known per se by means of a sleeve I6being put over the cord and screwed to the plug as indicated at Il inFig. 3.

The invention is of course not limited to the embodiment shown on thedrawing, but can be modied in several manners. It is for instance notnecessary that the sleeves and corresponding portions of the plug areaxially displaced relative to each other, but they may instead bearranged inside each other.

I claim:

1. In an electrical connecting device, a cord having conductors therein,thimbles on said conductors, resilient coaxial sleeves of differentdiameter at the ends of the thimbles remote from said conductors, meansfor holding said sleeves in position so as to form a unitary structure,means insulating the thimbles from each other, and a plug elementincluding coaxial cylindrical members insulated from each other andprojecting from both ends of said element, the portions of the membersprojecting from one end of said element having such diameter as to iitone of said sleeves, and the portions of said members projecting fromthe other end of said element being engageable with a jack.

2. A device according to claim 1 wherein said sleeves and saidcylindrical members of said plug are axially displaced relative to eachother.

3. A device according to claim 1 wherein two of said thimbles areprovided, the ends of the thimbles adjacent the conductors beingsegmentally shaped.

4. A device according to claim l wherein the ends of the thimblesadjacent the conductors are segmentally shaped to provide iiat portionsengaging said insulating means.

ERIK ISIDOR ENGQVIST.

REFERENCES CITED The following references are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name Date '711,556 Clausen Oct. 21, 1902r126,105 Scribner Apr. 21, 1903 1,642,064 Engstrom Sept. 13, 19271,680,430 Pacent Aug. 14, 1928 2,414,498 Warner et al Jan. 21, 1947FOREIGN PATENTS Number Country Date 74,401 Sweden May 31, 1932

